Jouvan Chandra Pratama Putra

• Putra, Jouvan Chandra Pratama; Suárez, Silvia; Mateos, Maria Jose; Lao-Zea, Angela; Akhtar, Naureen & Nielsen, Henrik Kofoed [Show all 7 contributors for this article] (2026). TiO<inf>2</inf>/activated-biochar hybrid materials: Weight ratio effects on formaldehyde adsorption and photodegradation. Results in Engineering (RINENG). 30. doi: 10.1016/j.rineng.2026.110337. Full text in Research Archive Show summary

  The performance of Adsorbent-Photocatalyst Hybrids (APHs) based on TiO2 P25 (Evonik) and activated-biochar was investigated for formaldehyde (HCHO) adsorption and photodegradation in the gas phase. Two commercial biochars (birch and Norway spruce) were characterised to identify the most effective adsorbent based on surface area. A microporous wood-based activated charcoal (1374 m2 g-1) served as a reference, with micropore and mesopore volumes of 0.53 and 0.74 cm3 g-1 and pore sizes below 7 nm, for adsorption comparison with the biochars. Subsequently, the selected biochar was activated via wet and dry impregnation methods and then incorporated with TiO2 P25 (Evonik) to form hybrid materials with various weight ratios. The hybrid materials were characterised using BET (surface area), XRF (elemental composition), total carbon analysis, TGA (thermal stability), XRD, and SEM. To evaluate the adsorption and photodegradation performance, a total flow rate of 900 mL min-1 and a HCHO concentration of 15 ppm under UV-A light were applied to the hybrid materials. The results indicated that birch-derived activated biochar with a particle size ≤ 0.5 mm exhibited the highest adsorption performance. When synergised with TiO2 P25 (Evonik) at a 75:25 wt ratio, the hybrid material demonstrated the optimal photodegradation rate and complete mineralisation. The enhanced performance confirms that activated biochar improves photocatalytic efficiency by increasing HCHO availability on the TiO2 P25 (Evonik) surface compared to pure TiO2 P25 (Evonik). These findings provide the optimisation of TiO2-biochar hybrids under high-flow gas-phase conditions and highlight their potential for passive indoor HCHO removal.

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• Putra, Jouvan Chandra Pratama; Vehus, Tore & Nielsen, Henrik Kofoed (2023). A Review on Electron-Hole Pairs Mechanism in Dark Photocatalysis. Full text in Research Archive

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